This was really nicely done, the bullet patterns were pitched at just the right level of difficulty, and I love the main gameplay idea. My only worry was that sometimes when it got quite hectic, I felt like I was just pounding the key at random instead of on the beat, and it still seemed to be dispatching the enemies pretty effectively. I also wish there had been at least one more level to try out.
Regardless, definitely one of my favourite games of the jam!